Failed to boot android on DragonBoard 845c

Hi team,
I have flashed the latest bootloader for aosp:
96boards/dragonboard845c/linaro/rescue/49/
And flasedh the latest aosp image to the device:
http://snapshots.linaro.org/96boards/dragonboard845c/linaro/aosp-master/340/

But it keeps reporting SufaceFlinger error and won’t boot up.
Full serial log and logcat can be found here.

01-01 00:00:24.616 307 307 I hwservicemanager: getTransport: Cannot find entry android.hardware.graphics.mapper@3.0::IMapper/default in either framework or device VINTF manifest.
01-01 00:00:24.616 439 439 D ComposerHal: failed to get mapper 3.0 service, falling back to mapper 2.0
01-01 00:00:24.615 0 0 I libprocessgroup: Successfully killed process cgroup uid 0 pid 473 in 0ms
01-01 00:00:24.621 457 457 F SurfaceFlinger: Missing internal display after registering composer callback.
--------- beginning of crash
01-01 00:00:24.621 457 457 F libc : Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 457 (surfaceflinger), pid 457 (surfaceflinger)
01-01 00:00:24.634 452 452 V APM_AudioPolicyManager: setOutputDevices() AF::createAudioPatch returned 0 patchHandle 12 num_sources 1 num_sinks 1
01-01 00:00:24.635 452 452 V APM_AudioPolicyManager: checkAndSetVolume cannot set volume group 4 volume with force use = 0 for comm
01-01 00:00:24.624 0 0 I init : processing action (apexd.status=ready && ro.product.cpu.abilist64=*) from (/system/etc/init/hw/init.rc:91)
01-01 00:00:24.636 0 0 I init : starting service ‘boringssl_self_test_apex64’…
01-01 00:00:24.639 452 486 I AudioFlinger: AudioFlinger’s thread 0xb400007147276040 tid=486 ready to run
01-01 00:00:24.640 452 486 W AudioFlinger: no wake lock to update, system not ready yet
01-01 00:00:24.650 488 488 I crash_dump64: obtaining output fd from tombstoned, type: kDebuggerdTombstone
01-01 00:00:24.651 421 421 I tombstoned: received crash request for pid 457
01-01 00:00:24.652 488 488 I crash_dump64: performing dump of process 457 (target tid = 457)
01-01 00:00:24.646 0 0 I init : SVC_EXEC service ‘boringssl_self_test_apex64’ pid 484 (uid 0 gid 0+0 context default) started; waiting…
01-01 00:00:24.656 488 488 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
01-01 00:00:24.656 488 488 F DEBUG : Build fingerprint: ‘Android/db845c/db845c:S/AOSP.MASTER/6619536:userdebug/test-keys’
01-01 00:00:24.656 488 488 F DEBUG : Revision: ‘0’
01-01 00:00:24.656 488 488 F DEBUG : ABI: ‘arm64’
01-01 00:00:24.657 488 488 F DEBUG : Timestamp: 1970-01-01 00:00:24+0000
01-01 00:00:24.657 488 488 F DEBUG : pid: 457, tid: 457, name: surfaceflinger >>> /system/bin/surfaceflinger <<<
01-01 00:00:24.658 488 488 F DEBUG : uid: 1000
01-01 00:00:24.658 488 488 F DEBUG : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
01-01 00:00:24.658 488 488 F DEBUG : Abort message: ‘Missing internal display after registering composer callback.’
01-01 00:00:24.658 488 488 F DEBUG : x0 0000000000000000 x1 00000000000001c9 x2 0000000000000006 x3 0000007fe8d6fa70
01-01 00:00:24.658 488 488 F DEBUG : x4 fefeff2d6a626061 x5 fefeff2d6a626061 x6 fefeff2d6a626061 x7 7f7f7f7f7f7f7f7f
01-01 00:00:24.658 488 488 F DEBUG : x8 00000000000000f0 x9 0000007138788628 x10 ffffff80ffffffdf x11 0000000000000001
01-01 00:00:24.658 488 488 F DEBUG : x12 0000007fe8d6fa40 x13 000000000000003e x14 0000007fe8d6fc10 x15 0000000034155555
01-01 00:00:24.658 488 488 F DEBUG : x16 0000007138821c60 x17 00000071387ffe50 x18 000000713f858000 x19 00000000000000ac
01-01 00:00:24.658 488 488 F DEBUG : x20 00000000000001c9 x21 00000000000000b2 x22 00000000000001c9 x23 00000000ffffffff
01-01 00:00:24.658 488 488 F DEBUG : x24 0000000000000002 x25 0000000000000000 x26 0000000000000000 x27 0000000000000000
01-01 00:00:24.658 488 488 F DEBUG : x28 0000000000000000 x29 0000007fe8d6faf0
01-01 00:00:24.658 488 488 F DEBUG : lr 00000071387b2ffc sp 0000007fe8d6fa50 pc 00000071387b302c pst 0000000000000000
01-01 00:00:24.681 488 488 F DEBUG : backtrace:
01-01 00:00:24.681 488 488 F DEBUG : #00 pc 000000000004b02c /apex/com.android.runtime/lib64/bionic/libc.so (abort+180) (BuildId: fc04a5ceb624fbfed33cabb3345bffc1)
01-01 00:00:24.681 488 488 F DEBUG : #01 pc 0000000000006324 /system/lib64/liblog.so (__android_log_default_aborter+12) (BuildId: 03135c72fe1e1bb0c1f18ca7f7ba3d23)
01-01 00:00:24.681 488 488 F DEBUG : #02 pc 0000000000006e60 /system/lib64/liblog.so (__android_log_assert+312) (BuildId: 03135c72fe1e1bb0c1f18ca7f7ba3d23)
01-01 00:00:24.681 488 488 F DEBUG : #03 pc 00000000000d11d8 /system/lib64/libsurfaceflinger.so (android::SurfaceFlinger::init()+1248) (BuildId: dac6922370e6abb961d8360aee76cf87)
01-01 00:00:24.681 488 488 F DEBUG : #04 pc 00000000000021a8 /system/bin/surfaceflinger (main+352) (BuildId: fb6edc5a18b2c241805ad15480197e00)
01-01 00:00:24.682 488 488 F DEBUG : #05 pc 00000000000460a4 /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108) (BuildId: fc04a5ceb624fbfed33cabb3345bffc1)
01-01 00:00:24.674 0 0 I init : Service ‘boringssl_self_test_apex64’ (pid 484) exited with status 0 waiting took 0.029000 seconds
01-01 00:00:24.684 0 0 I init : Sending signal 9 to service ‘boringssl_self_test_apex64’ (pid 484) process group…
01-01 00:00:24.696 427 427 D zygote64: Time zone APEX ICU file found: /apex/com.android.tzdata/etc/icu/icu_tzdata.dat
01-01 00:00:24.696 428 428 D zygote : Time zone APEX ICU file found: /apex/com.android.tzdata/etc/icu/icu_tzdata.dat
01-01 00:00:24.694 0 0 I libprocessgroup: Successfully killed process cgroup uid 0 pid 484 in 0ms
01-01 00:00:24.703 0 0 I init : processing action (sys.init.perf_lsm_hooks=1) from (/system/etc/init/hw/init.rc:1003)

Do you have a monitor plugged in to it?

Connected the device with a monitor through HDMI, and the monitor seem get no signal all the time.